The York County coroner's office says today's autopsy wasn't able to conclude what caused 28-year-old James Earl Greer Jr.'s death.

County prison officials said Greer was found unresponsive in his cell around 3 a.m. Tuesday. He was facing charges in the December 7th strangling death of his ex-girlfriend, 32-year-old Heather Marie Bechtel, in Lower Paxton Township.

Toxicology tests are being performed. It may take several months to get the results.

Authorities alleged that after killing Bechtel in her apartment, Greer tried unsuccessfully to poison himself with household cleaning solutions.